<!DOCTYPE html>

<html>
    <head>
        <meta charset="utf-8">
        <title>菜鸟教程(runoob.com)</title>
    </head>

    <body>
        <p>判断是否为数组。</p>
        <p id="demo"></p>
        <script>
            var fruits = ["Banana", "Orange", "Apple", "Mango"]
            document.getElementById("demo").innerHTML = isArray(fruits)
            function isArray(myArray)
            {
                return myArray.constructor.toString().indexOf("Array") > -1
            }
        </script>
    </body>
</html>